Sorry Fred, I originally thought they were two different issues but they appear to be related.
If you want to delete the other thread, that's fine.

When I made the paper a larger size, checked the box that says "use actual size", add my images to the print queue and then trim the white off, the images get resized.  It does this ALL the time regardless of what option is checked in the borderless box and regardless if the borderless box itself is checked or unchecked.  It ALWAYS does this.

See my last post in the other thread about trying it without the poster size, but if the above is true (even when you don't have a poster size), then there is a bug in the printer driver where it is not responding properly to paper size changes outside the driver.  Because I can't change the driver, the solution to that would be to not use a page size that is too big so that you have to trim it: use the correct paper size up front.

That said, this still sounds like a problem with scaling in the driver.  Per the other thread, you have to select "print image with actual size" when you select borderless otherwise the driver is going to be doing scaling.  What happens if you don't select that option is that as soon as you give Qimage Ultimate the command to remove white space, QU sends a command to the driver telling it to reduce the paper size: then the driver sees the new paper size and it RESCALES the image to try to fit the new size.  And therein lies the problem.

Mike

I believe so.  At this point I think that the driver is doing some sort of "fit to page" type scaling and when you change the page length (via the trim function), it updates the paper size in the driver and that causes the driver to automatically rescale the print/size to fit the modified paper size.  The way the drivers often scale images is by increasing or decreasing the PPI reported back from the driver.  So in this case it just looks to me like the trim function in Qimage Ultimate and the driver's page/image scaling are not playing together nicely.  I haven't seen that problem before as the ipf8300's options for borderless look a little "funky" in that they're not following the typical industry standard.  The Canon standard is to allow borderless and then offer an "amount of expansion" slider that controls how much borderless expansion is performed.  These new borderless scaling features (with the only one that allows NO scaling being grayed out when you do borderless) is something relatively new.  These new borderless scaling options appear to be quite limiting in that there appears to be no way to print a borderless print without the driver trying to scale it to the paper size.

Mike